The Nittany Lions were in control for most of the weekend, but managed to make the sweep possible thanks to a seventh-inning comeback against South Dakota State early in the weekend.
The Nittany Lions overwhelmed the Badgers to set up a third and final game of the Big Ten quarterfinal.
The junior finished with a time of 2:03.69, moving from fifth to first place on the home stretch to edge Penn's Nia Akins, who finished with a time of 2:03.74.
Barratt boarded Wisconsin defenseman Wyatt Kalynuk as the final buzzer sounded on Penn State's 4-3 loss to the Badgers in game 1 of the Big Ten quarterfinal.
A Sean Dhooghe hat trick buried the Nittany Lions and gave the Badgers a 1-0 lead in this weekend's Big Ten quarterfinal.
Washington won three Big Ten regular season titles and posted a 209-169 record in her 12-year tenure in charge of the Lady Lions.